'\" te
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.TH LDAP_BIND 3LDAP "Jan 14, 2004"
.SH NAME
ldap_bind, ldap_bind_s, ldap_sasl_bind, ldap_sasl_bind_s, ldap_simple_bind,
ldap_simple_bind_s, ldap_unbind, ldap_unbind_s, ldap_unbind_ext,
ldap_set_rebind_proc, ldap_sasl_interactive_bind_s \- LDAP bind functions
.SH SYNOPSIS
.LP
.nf
cc [ \fIflag\fR... ] \fIfile\fR... -lldap [ \fIlibrary\fR... ]
#include <lber.h>
#include <ldap.h>

\fBint\fR \fBldap_bind\fR(\fBLDAP *\fR\fIld\fR, \fBchar *\fR\fIwho\fR, \fBchar *\fR\fIcred\fR, \fBint\fR \fImethod\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_bind_s\fR(\fBLDAP *\fR\fIld\fR, \fBchar *\fR\fIwho\fR, \fBchar *\fR\fIcred\fR, \fBint\fR \fImethod\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_simple_bind\fR(\fBLDAP *\fR\fIld\fR, \fBchar *\fR\fIwho\fR, \fBchar *\fR\fIpasswd\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_simple_bind_s\fR(\fBLDAP *\fR\fIld\fR, \fBchar *\fR\fIwho\fR, \fBchar *\fR\fIpasswd\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_unbind\fR(\fBLDAP *\fR\fIld\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_unbind_s\fR(\fBLDAP *\fR\fIld\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_unbind_ext\fR(\fBLDAP\fR \fI*ld\fR, \fBLDAPControl **\fR\fIserverctrls\fR,
     \fBLDAPControl **\fR\fIclientctrls\fR);
.fi

.LP
.nf
\fBvoid\fR \fBldap_set_rebind_proc\fR(\fBLDAP\fR \fI*ld\fR, \fBint (*\fR\fIrebindproc\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_sasl_bind\fR(\fBLDAP *\fR\fIld\fR, \fBchar *\fR\fIdn\fR, \fBchar *\fR\fImechanism\fR,
     \fBstruct berval **\fR\fIserverctrls\fR, \fBLDAPControl **\fR\fIclientctrls\fR,
     \fBint *\fR\fImsgidp\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_sasl_bind_s\fR(\fBLDAP *\fR\fIld\fR, \fBchar *\fR\fIdn\fR, \fBchar *\fR\fImechanism\fR,
     \fBstruct berval *\fR\fIcred\fR, \fBLDAPControl **\fR\fIserverctrls\fR,
     \fBLDAPControl **\fR\fIclientctrls\fR);
.fi

.LP
.nf
\fBint\fR \fBldap_sasl_interactive_bind_s\fR(\fBLDAP *\fR\fIld\fR, \fBchar *\fR\fIdn\fR,
     \fBchar *\fR\fIsaslMechanism\fR, \fBLDAPControl **\fR\fIsctrl\fR, \fBLDAPControl **\fR\fIcctrl\fR,
     \fBLDAPControl **\fR\fIunsigned flags\fR, \fBLDAP_SASL_INTERACT_PROC *\fR\fIcallback\fR,
     \fBvoid *\fR\fIdefaults\fR);
.fi

.SH DESCRIPTION
.sp
.LP
These functions provide various interfaces to the LDAP bind operation. After a
connection is made to an LDAP server, the \fBldap_bind()\fR function returns
the message ID of the request initiated. The \fBldap_bind_s()\fR function
returns an LDAP error code.
.SS "Simple Authentication"
.sp
.LP
The simplest form of the bind call is \fBldap_simple_bind_s()\fR. The function
takes the DN (Distinguished Name) of the \fIdn\fR parameter and the
\fBuserPassword\fR associated with the entry in \fIpasswd\fR to return an LDAP
error code. See \fBldap_error\fR(3LDAP).
.sp
.LP
The \fBldap_simple_bind()\fR call is asynchronous. The function takes the same
parameters as \fBldap_simple_bind_s()\fR but initiates the bind operation and
returns the message ID of the request sent. The result of the operation can be
obtained by a subsequent call to \fBldap_result\fR(3LDAP).
.SS "General Authentication"
.sp
.LP
The \fBldap_bind()\fR and \fBldap_bind_s()\fR functions are used to select the
authentication method at runtime. Both functions take an extra \fImethod\fR
parameter to set the authentication method. For simple authentication, the
\fImethod\fR parameter is set to \fBLDAP_AUTH_SIMPLE\fR. The \fBldap_bind()\fR
function returns the message id of the request initiated. The
\fBldap_bind_s()\fR function returns an LDAP error code.
.SS "SASL Authentication"
.sp
.LP
The \fBldap_sasl_bind()\fR and \fBldap_sasl_bind_s()\fR functions are used for
general and extensible authentication over LDAP through the use of the Simple
Authentication Security Layer. The routines both take the \fBDN\fR to bind as
the authentication method. A dotted-string representation of an OID identifies
the method, and the \fBberval\fR structure holds the credentials. The special
constant value \fBLDAP_SASL_SIMPLE\fR ("") can be passed to request simple
authentication. Otherwise, the \fBldap_simple_bind()\fR function or the
\fBldap_simple_bind_s()\fR function can be used.
.sp
.LP
The \fBldap_sasl_interactive_bind_s()\fR helper function takes its data and
performs the necessary \fBldap_sasl_bind()\fR and associated SASL library
authentication sequencing with the LDAP server that uses the provided
connection (\fIld\fR).
.sp
.LP
Upon a successful bind, the \fBldap_sasl_bind()\fR function will, if negotiated
by the SASL interface, install the necessary internal \fBlibldap\fR plumbing to
enable SASL integrity and privacy (over the wire encryption) with the LDAP
server.
.sp
.LP
The \fBLDAP_SASL_INTERACTIVE\fR option flag is passed to the libldap API
through the flags argument of the API. The flag tells the API to use the SASL
interactive mode and to have the API request SASL authentication data through
the \fBLDAP_SASL_INTERACTIVE_PROC\fR callback as needed. The callback provided
is in the form:
.sp
.in +2
.nf
typedef int (LDAP_SASL_INTERACT_PROC)
    (LDAP *ld, unsigned flags, void* defaults, void *interact);
.fi
.in -2
.sp

.sp
.LP
The user-provided SASL callback is passed to the current LDAP connection
pointer, the current flags field, an optional pointer to user-defined data, and
the list of \fBsasl_interact_t\fR authentication values requested by
\fBlibsasl\fR(3LIB) to complete authentication.
.sp
.LP
The user-defined callback collects and returns the authentication information
in the \fBsasl_interact_t\fR array according to \fBlibsasl\fR rules. The
authentication information can include user IDs, passwords, realms, or other
information defined by SASL. The SASL library uses this date during sequencing
to complete authentication.
.SS "Unbinding"
.sp
.LP
The \fBldap_unbind()\fR call is used to unbind from a directory, to terminate
the current association, and to free the resources contained in the \fIld\fR
structure. Once the function is called, the connection to the LDAP server is
closed and the \fIld\fR structure is invalid. The \fBldap_unbind_s()\fR and
\fBldap_unbind()\fR calls are identical and synchronous in nature.
.sp
.LP
The \fBldap_unbind_ext()\fR function is used to unbind from a directory, to
terminate the current association, and to free the resources contained in the
LDAP structure. Unlike \fBldap_unbind()\fR and \fBldap_unbind_s()\fR, both
server and client controls can be explicitly included with
\fBldap_unbind_ext()\fR requests. No server response is made to an unbind
request and responses should not be expected from server controls included with
unbind requests.
.SS "Rebinding While Following Referral"
.sp
.LP
The \fBldap_set_rebind_proc()\fR call is used to set a function called back to
obtain bind credentials. The credentials are used when a new server is
contacted after an LDAP referral. If \fBldap_set_rebind_proc()\fR is never
called, or if it is called with a \fBNULL\fR \fIrebindproc\fR parameter, an
unauthenticated simple LDAP bind is always done when chasing referrals.
.sp
.LP
The \fBrebindproc()\fR function is declared as shown below:
.sp
.in +2
.nf
int rebindproc(LDAP *ld, char **whop, char **credp,
    int *methodp, int freeit);
.fi
.in -2

.sp
.LP
The LDAP library first calls the \fBrebindproc()\fR to obtain the referral bind
credentials. The \fIfreeit\fR parameter is zero. The \fIwhop\fR, \fIcredp\fR,
and \fImethodp\fR parameters should be set as appropriate. If
\fBrebindproc()\fR returns \fBLDAP_SUCCESS\fR, referral processing continues.
The \fBrebindproc()\fR is called a second time with a non-zero \fIfreeit\fR
value to give the application a chance to free any memory allocated in the
previous call.
.sp
.LP
If anything but \fBLDAP_SUCCESS\fR is returned by the first call to
\fBrebindproc()\fR, referral processing is stopped and the error code is
returned for the original LDAP operation.
.SH RETURN VALUES
.sp
.LP
Make a call to \fBldap_result\fR(3LDAP) to obtain the result of a bind
operation.
.SH ERRORS
.sp
.LP
Asynchronous functions will return \fB\(mi1\fR in case of error. See
\fBldap_error\fR(3LDAP) for more information on error codes returned. If no
credentials are returned, the result parameter is set to \fINULL\fR.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Evolving
_
MT-Level	Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR ldap (3LDAP),
.BR ldap_error (3LDAP),
.BR ldap_open (3LDAP),
.BR ldap_result (3LDAP),
.BR libsasl (3LIB),
.BR attributes (7)
